It appears I am having a similar problem as some other people but thought i’d start my own topic rather than hijack another one.
I am trying to get twitter cads for blog.carsforsale.com and I am able to get a preview when i put in the sample domain of Carsforsale.com Blog. However, it says I am not whitelisted. When I request approval for whitelisting, it gives me the error message of
*.blog.carsforsale.com whitelist request failed
ERROR: Invalid domain pattern
Is this because our @Carsforsalecom twitter handle has the main site www.carsforsale.com attached to is and not Blog.Carsforsale.com like I am trying to get whitelisted? Other than that I dont know why this error message is appearing